Every Editor in Blender is divided into Regions. Regions can have smaller structuring elements like tabs and panels with buttons, controls and widgets placed within them.


The regions of the 3D Viewport showing the Sidebar and the Adjust Last Operation panel after adding a Cube.

Header (green), Main region (yellow), Toolbar (blue), Sidebar (red) and Adjust Last Operation panel (pink).

Main Region

At least one region is always visible. It is called the Main region and is the most prominent part of the editor.

Each editor has a specific purpose, so the main region and the availability of additional regions are different between editors. See specific documentation about each editor in the Editors chapter.


The Toolbar (on the left side of the editor area) contains a set of interactive tools. T toggles the visibility of the Toolbar.

This is further documented here: Toolbar.

Tool Settings

The Tool Settings (at the top/bottom of the editor area) contains as its name suggests the settings of the active tool. It’s visibility can be toggled with the header’s context menu just as its position with the Flip to Bottom/Top operator.

Adjust Last Operation

The Adjust Last Operation is a region that shows tool options when tools (operators) are run.

This is further documented here: Adjust Last Operation.



A region can be scrolled vertically and/or horizontally by dragging it with the MMB. If the region has no zoom level, it can be scrolled by using the Wheel, while the mouse hovers over it.

Changing the Size and Hiding

Resizing regions works by dragging their border, the same way as Areas.

To hide a region resize it down to nothing. A hidden region leaves a little arrow sign. LMB on this icon to make the region reappear.

Hiding and showing the Sidebar.